FRUIT FLIES OF THE RYUKYU ISLANDS 



49 



section; r-iu perpendicular, situated at 2/3 of IM2; m-cu 

 distinctly oblique with acute posterior angle; anal cell 

 distinctly shorter than basal cell (M), but with very 

 long posterior prolongation. Halteres light yellow, 

 w'ith comparatively long stalk. 



Legs yello\\-, with tarsi whitish yellow, black pubes- 

 cent, comparatively short. Foreleg (pi. 18, fig. 10) 

 conspicuously shorter than posterior pairs; femur dis- 

 tinctlj' longer than tibia, externodorsal surface with 

 three rows of long bristly hairs, externoventral margin 

 with one row of approximately seven very long bristly 

 hairs; tibia somewhat shorter than tarsus, pubescence 

 more or less longer on dorsal surface, one or two long 

 hairs near apex of dorsal surface; first tarsal segment 

 neai'ly as long as four following segments together, 

 the yellowish brushlike bristles on internoventral 

 surface rather long. Midleg (pi. 18, fig. 11) longest; 

 femur as long as tibia, ventral surface with two rows 

 of somewhat conspicuous bristly hairs, the apical ones 

 longest, one long hair near base of internoventral mar- 

 gin; tibia with black apical spur, in addition to two 

 shorter black spines on external apical margin, where 

 additional shorter yellowish bristles are situated; first 

 tarsal segment distinctly longer than the four following 

 segments together, less than half as long as tibia, with 

 one row of moderately long sparse blackish bristly 

 hairs and with some spinelike black bristles on apical 

 half of externoventral margin, hiternoventral surface 

 with yellow'ish brushlike setae on basal half; second 

 tarsal segment nearly twice as long as following one. 

 Hindleg (pi. 18, fig. 12): femur somewhat longer than 

 tibia, dorsal apex with three long black bristles, 

 externoventral margin with one row of long hairs, 

 of which some at apex are bristly and one near base is 

 conspicuously long, at about middle of external surface 

 one row of black bristly hairs becoming obscure 

 apically; tibia with one row of long black sparse bristles 

 on externodorsal margin; fii'st tarsal segment conspicu- 

 ously shorter than half the length of tibia, slightly 

 longer than the four following segments together, the 

 bristles and setae of all tarsal segments as on midtarsus. 



Length: Body 6 mm, wing 5.5 mm. 



HoLOTYPE. — Male, Mt. Yuwan, Amami-Oshima Is., 

 May 3, collected by Mr. S. Iha (NIAS). 



Genus Acrotaeniostola Hendel 



Acrotaeniostola Hendel, 1914, p. 80; 1915, p. 43fi. — Shiniki, 

 1933, p. U^. 



Acrotaeniostola antennata, new species 



Pl.\te 19 



Closely allied to .1. flavoscutellata Shiraki, but easily 

 distinguished bv the third antennal segment, which 



has an undulate dorsal margin and two genal bristles. 

 Male. — Head nearly as wide as thorax, 1.6 times 

 as wide as long, 1.4 tunes as wide as high, somewhat 

 transverse-oblong. Frons (pi. 19, fig. 3) nearly as wide 

 as one eye, parallel-sided, very slightly elevated above 

 eyes, yellowish bro«n or reddish brown, sometimes 

 with an ill-defined dark median strii)e, middle portion 

 with very few black short erect hairs; vertical calli 

 sometimes brown, shining, very long and well elevated, 

 reaching to about middle of frons; lunule very narrow, 

 slightly shining; ocellar triangle blackish browii, no 

 distinct transverse carina. Face (pi. 19, fig. 4) waxy 

 grej'ish white, more or less obscured by a whitish 

 tomentum, slightly concave, distinctly shorter than 

 wide, with straight lateral margins; orbits yeOowish, 

 whitish tomentose, narrow but well defined, parallel- 

 sided; antennal grooves moderate in depth, their outer 

 slopes yellowish; \ibrissal marghi with three or four 

 short, black, inwardly directed bristles and several 

 longer, downw^ardly-directed bristles. Back of head 

 (pi. 19, fig. 2) swollen, the upper half blackish brown 

 with occiput more or less yellowish, somewhat obscured 

 by whitish tomentum, lower half yellowish witii a 

 very sparse black pubescence becoming longer and 

 bi'istly toward inferior siu'face; cheeks very narrow, 

 with long black bristly hairs on inferior border. Eyes 

 quite bare, in profile moderately oblique, 2/3 as wide 

 as long, with moderately convex posterior margin, and 

 slightly narrowed, round inferior angle. Antenna (pi. 19, 

 fig. 5) inserted at about middle of eye, a little shorter 

 than face; first segment very short, pale yellowish; 

 second segment comparatively large, dirty yellow, 

 without distinct median bristle, ventral corner with 

 rather long black bristles; third segment 2.G tunes as 

 long as second, 3.2 times as long as wide, gradually 

 narrowed toward somewhat pointed apex and bent 

 dorsally at apical thkd, dorsal margin more or less 

 undulate beyond middle; arista black with basal por- 

 tion light yellow, sparsely plumose. Palpi (pi. 19, 

 fig. 6) light yellow, narrow and straight, with com- 

 paratively long black bristly haii-s on inferior border, 

 tip rounded. All bristles black: fronto-orbitals 2 : 3, 

 the superior pair directed slightly outward, lower 

 longest of all fronto-orbitals, inferior paii" more or less 

 crossing and shorter than superior; ©cellars compara- 

 tively long, divergent; inner verticals longest, directed 

 slightly mward, outer longer than the upper sui)erior 

 fronto-orbital ; postverticals parallel, comparative!}- 

 long, a little shorter than upper superior fronto-orbital, 

 a distinct bristle (inner occipital) directed inward 

 between and behind latter and postvertical; bristles 

 of occipital row extending to below middle of eye, 

 composed of long bristles. 



